Bag sealing machine



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Oct. 16, 1956 Filed March 10, 195?- w. H. BRYCE BAG SEALING MACHINE 1oShets-Sheet 3 INVENTOR ATTORNEYS.

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BAG SEALING MACHINE Filed March l0, 1952 10 Sheets-Sheet 4 INVENTORATTORNEYS;

Oct. 16, 1956 w. H. BRYCE 2,766,571

BAG SEALING MACHINE Filed March 10, 1952 10 She'ets-Sheet 5 1N VENTORATTORNEYS W. H. BRYCE BAG SEALING MACHINE Oct. 16, 1956 10 SheetsSheet 6Filed March 10, 1952 INVENTOR ATTORNEYS Oct 1956 w. H. BRYCE BAG SEALINGMACHIN' 10 Sheets-Sheet 7 Filed March .10, 1952 INVENTQR ATTORNEYS.

Oct. 16, 1956 w. H. BRYCE 2,766,571

BAG SEALING MACHINE Filed March 10, 1952 10 Sheets-Sheet 8 Oct. 16, 1956w BRYCE BAG SEALING MACHINE 10 Shets- Sheet 9 Filed March 10, 1952INVENTOR,

ATTORNEYS:

00L 1956 w. H. BRYCE BAG SEALING MAd'iiINE l0. Sheets-Sheet 10 FiledMarch l0, 1952 ATTORNEYS,

United Statesv FatentC BAG SEALING MACHINE William H. Bryce, Memphis,Tenn., assignor to Dixie Wax Paper Company, Dallas, Tex.

Application March 10, 1952, Serial No. 275,735 4 Claims. c1. 53-373 Thepresent invention relates to machines for sealing bags and moreparticularly machines for closing and sealing wax coated paper bagscontaining foodstuffs, such as potato chips, in a progressive andcontinuous manner.

Applicant has a co-pending application Serial No. 193,390 filed November1, 1950, directed to a Method of Sealing Containers.

Ordinary glassine papers are usually coated with a thin layer ofparaffin wax or a rubbery-wax composition to increase their moisture andmoisture-vapor-proof qualities. This so coated glassine paper is fed tobag forming machineswhere bags are formed in standard lengths with theirbottom portion folded over and heat sealed leaving their upper ends openwhereby they may be filled with foodstuffs and it is an object of theinvention to provide a machine for folding, molding and permanently heatsealing the open ends of such bags without employing other adhesives orapplying thick coatings of parafiin wax to the paper where the seals areto be effected.

With the conventional methods of heat sealing wax coated bags, electricheaters are usually employed which reach high temperatures and if theheat is applied to the wax for more than two seconds the wax gives offfumes which have a tendency to enter the bags and thereby contaminatethe foodstuffs therein and it is another object of the invention toprovide a machine whereby heat may be applied only momentarily or for awillcient period of time as will cause the wax upon the paper bag tosoften without giving off any detrimental fumes as would cause a changein the taste of the foodstuffs or render the same less desirable forconsumption and thereafter molding the softened wax about the open endof the bag at reduced temperatures under pressure as will effect apermanent seal.

And still another object of the invention is to provide a machine thatwill instantly form a multiple fold about the open ends of wax coatedpaper bags and apply heat to the opposite faces of each fold as willsoften the wax thereupon and subsequently cause the folded ends of thebags to be molded together under pressure as will cause the wax tocongeal upon the opposite face of each fold.

Other objects of the invention will be in part obvious and in partpointed out hereinafter as the description continues.

In the accompanying drawings:

Fig. 1 is a front elevation of a complete bag sealing machine embodyingthe present invention;

Fig. 2 is a plan view of the same;

Fig. 3 is an end elevation;

Fig. 4 is a vertical transverse section taken on the line 4-4 of Fig. 2in the direction of the arrow points;

Fig. 5 is an enlarged fragmental section taken substantially on the line5-5 of Fig. 2 in the direction of the arrow points;

Fig. 6 is an enlarged fragmental view taken substantially on the line 66of Fig. 2 to illustrate the rocker arm for the tucker blade assembly andits cam for transmitting an oscillating movement thereto;

Fig. 7 is a plan view of the rocker arm on a reduced scale;

Fig. 8 is a side elevation of the same;

Fig. 9 is a side elevation of the cam which operates the rocker armsimilar to that shown in Fig. 6 that transmits motion to a movablesection of a cooler;

Fig. 10 is an enlarged end elevation of the roller-heater assembly andthe tucker-blade assembly;

Fig. 11 is a similar view taken from the opposite end thereof;

Fig. 12 is a fragmental plan view of the same;

Fig. 13 is a detailed side elevation of the lower tuckerblade section;

Fig. 14 is an end elevation of the same;

Fig. 15 is a vertical transverse section of the upper movabletucker-blade section;

Fig. 16 is an end elevation of the same;

Fig. 17 illustrates diagrammatically the first movement of the rollerassembly and the tucker-blade assembly;

Fig. 18 is a similar view illustrating the second movement thereof;

Fig. 19 is a similar view illustrating the third movement thereof;

Fig. 20 is a similar view illustrating the final movement thereof;

Fig. 21 is an end elevation of the cooler-assembly on a reduced scale;

Fig. 22 is a fragmental plan view of the same;

Fig. 23 is a fragmental illustration of the initial movement of thecooler assembly; and

Fig. 24 is a similar view illustrating the final movement of the coolerassembly.

The bag 1 is of a standard design as produced from a conventional bagforming machine and is preferably wax composition so as to render thesame moisture and moisture-vapor-proof as is desired for holdingfoodstuffs such as potato chips.

These bags may be filled with a pre-detennined quantity of potato chipsand then deposited within the baskets 2 whereupon the bottom of each bagwill rest upon a smooth topped table 3. The baskets 2 may be arranged ingroups of three each as is best illustrated in Fig. 2 of the drawing.These baskets are conveyed by means of a rubber belt 4 for deliveringthe bags 1 first to a tucking and heating operation and then toa coolingand molding operation under pressure. The bags 1 for containing potatochips may be deposited within the baskets 2 when at the station 5whereby, through an intermittent movement transmitted to the belt 4,said group of bags are moved from the station 5 to the station 6 then tothe station 7, then to the station 8 where they are subjected to thetucking and heating operation, then to the station 9 where they aresubjected to the cooling and molding operation, and finally to thestation 10 where the bags are allowed to slide by gravity through thebaskets and a cut-away portion of the table top 3 and be depositedwithin suitable packing boxes for shipment.

Whereas I have illustrated the baskets as being arranged in groups ofthree, any number of baskets as condition or preference may dictate arearranged within each group and also the collapsed bags may be firstdeposited within the baskets when positioned at the station 5. As thesebaskets containing the bags are moved tothe station 6, they may beopened preferably by an air blast and as each group moves to the station7 the bags may be filled with a pre-determined quantity of potato chipswhereupon the mouth or open end of each bag may be first tucked andsimultaneously heated so as to soften the wax coating thereon when movedto the station 8 and then finally moved to the station 9 where thetucked ends of the bag are molded and cooled under pressure so that theWax.

will congeal as would form a complete seal without the use of expensiveglues or thick coatings of wax upon the paper bags.

The table 3 is preferably of the design as best shown in Fig. 2 with achannel bar flange 11- welded to the under side thereof and dependingtherefrom. This table 3 is supported at its opposite ends by a pair ofH-shaped movable frames each consisting of a pair of cylindrical siderods 12 connected by a cross bar 13. The table 3 rests upon the upperends of the tubular side rods 12 and is retained thereupon by means ofthe depending flange 11 whereas the lower ends of these tubular siderods are slidably mounted with the vertically extending and spacedtubular members 14 and 15. The tubular members 14 and 15 are connectedto the angle bars 16 and the latter are each provided with a bearingblock 17 and in each of the latter is journalled a screw rod 18. Theupper end of the screw rods 18 each have threaded engagement with asocket 19 as carried by cross bars 13 of the H-shaped frames. Thesescrew shafts 18 are each provided with a sprocket wheel connected bymeans of a sprocket chain 20 and one of these screw shafts 18 isprovided with a hand wheel 21 whereby upon rotation of the latter theH-shaped frames may be vertically movable in unison and carry the tabletop 3 therewith so as to adjust the same vertically with respect to thelower ends of the baskets 2 in order to accommodate standard bags ofvarious lengths. The right hand end of the table 3 is cut away so as torelease its support of the bags as they reach the station 10.

The bags 1 are capable of sliding vertically within their respectivebaskets 2 as the upper and lower ends of the latter are open, but as thebottom seam of each bag passes through the station 8, it is heated bymeans of a heater 22 attached to the lower face of the table 3. By soheating the bottom seams of the bag, the wax coating thereon will againbe softened so that when the bags proceed from station 8 to station 9they will be allowed to cool causing the wax to congeal and effect abetter seal at the bottom ends of the bags over that as is effected bythe usual heat sealing devices upon standard bag making machines.

Each basket is supported by a bracket 23 having a pin 24 extendedtherefrom which extends through an opening within conveyor belt 4. Thesepins 24 as the belt passes over the sheaves 25 and 26 register withinopenings 27 formed within the sheaves so as to effect a gearedconnection between the belt and sheaves. Each sheave is supported by ashaft 28 and these shafts pass through the guide bearings 29 that arecarried by the depending flange 11 of the table top 3 and their lowerend are journalled within bearings 31} that are supported by the anglebars 31 which latter are connected to the tubular members 14 and 15. Oneof the shafts 28 or that arranged at the left hand side of the machineas looking towards the latter shown in Fig. 1 of the drawing has apulley keyed thereto over which passes a belt 32 and this belt 32extends over a pulley keyed upon the shaft 33. The shaft 33 isjournalled within bearings 34 carried by the brackets 31 and 35 and alsokeyed to this shaft 33 is a starwheel 36 which latter has engagementwith a worm cam 37 whereupon with the rotation of the cam 37 in thedirection of the arrow as shown in Fig. 3, the star wheel will be givena rotary intermittent movement whereby the latter is transmitted throughthe belt 32 to the shaft 28 as carried by the sheave 25 whereby thegroups of baskets 2 will be moved in the direction as shown by the arrowin Fig. 2 of the drawings progressively from one station to the otheralong the table top. x

The tubular members 15 provide the forward vertical supports of themachine frame whereas the tubular members 33 connected to the tubularmember 15 by means of the bar 16 provide the rear supports of themachine frame and the tubular members 38 are connected by means of thelongitudinally extending rods 39. Tubular supports 46 are positionedupon the angle iron 41 and 4 are connected by the longitudinallyextending rods 42 whereas the upper ends of the tubular members 38 and40 are connected by the end angle irons 43 and intermediate angle irons44 as well as the forward angle irons 45 and the rear angle irons 46.

Journalled within suitable bearings 17 supported by the angle irons 16of the machine frame is a cam shaft 47 having keyed to one end thereofthe worm cam 37 whereas its opposite end is provided with a pulley overwhich extends a drive belt 48 and the latter being driven by an electricmotor 49 as supported upon the platform 50. This motor 49 drives thebelt 48 in the direction of the arrow as shown in Fig. 4 of the drawingin order to rotate the cam shaft in the direction of the arrow as isalso shown in this view. Suitable intermediate angle iron brackets 51have their opposite ends connected to the vertical standards 38 and 4t)and secured to one of these brackets 51 is a bearing 52 to which ispivotally connected as at 53 to a rocker arm 54. The lower end of thisarm 54 has an extension 55 carrying a roller 56 and the latter isadapted to travel within the cam groove 57 as formed within one face ofthe cam wheel 58 so that upon rotation of the cam shaft 47 anoscillating movement will be transmitted to the rocker arm 54. The upperend of this rocker arm 54 has a link 59 connected thereto and theopposite end of this link 59 has pivotally connected thereto a lever 60which operates the roller.- assembly. Supported upon two of the crossbars 51 are bearing blocks 61 in which are journalled the opposite endof a cross bar 62 forming part of a rocker arm. A depending tubular arm63 has its upper end secured to the cross bar 62 and a roller 64connected to its lower end by means of a link 65. The tucker cam 66 hasa cam groove 67 formed in the one face thereof in which rides the roller64 so that upon rotation of the cam shaft 47 an oscillating movementwill be given to the tucker arm. The tucker arm also consists of a pairof spaced arms 68 having their lower end connected to the pivot bar 62and their upper ends connected to a rod 69. A pair of end plates 70connect the rods 69 with the rod 71 and connected to the opposite end ofthe latter are the depending links 72 to which are connected the tuckerblade assembly. A cover plate 73 may be attached by means of the screws74 to the bars 71 and 68 so as to protect the roller-heater assembly.

Another rocker arm similar to that shown in Figs. 6, 7 and 8 inclusiveof the drawings is journalled within the bearings 74 as carried by thecross brackets 51 and the lower end of this arm is provided with aroller 75 which travels upon the outer surface of a cam 76 keyed to thecam shaft 47 and the opposite end of this and supports the movablecooler so that upon rotation of the cam shaft 47 the movable cooler willbe moved to and from the stationary cooler so as to mold the upper endsof the bag 2 when the same are being subjected to the cooling orcongealing operation. A bearing block 77 is supported by each of thecross brackets 51 and journalled therein is the rod 78 which latterpivotally supports a rocker arm 79 and the upper end of this arm 79 ispivotally connected to arm 79' pivotally supported at its medial portionby bar 80' extending from cooler 131 and which arm 79' is pivotallyconnected at its opposite end to link 80 connected to the punch assemblyfor punching holes within the upper end of the bags whereas the lowerend of this arm 79 provided with a roller 81 adapted to travel upon theouter circumference of a cam 82 carried by the cam shaft 47 in orderthat upon rotation of the latter an oscillating movement may betransmitted to the arm 79.

The heater-roller assembly is supported by means of a bracket 83 havingits lower end attached by means of the bolts 84 to the supporting frame.The vertically extending bearing blocks 85 are secured to the bracket 83by means of the bolts 86 and journalled within these bearing blocks 85are the end shafts of a corrugated roller 87. One end shaft 88 has keyedthereto the roller arm 68 having its upper end attached to the link 59.Also journalled Within the bearing blocks 85 is an upper corrugatedroller 90 and a lower corrugated roller 91 and these rollers 90 and 91are normally retained in resilient contact by means of the leaf springs93 with the roller 87 whereupon with the rotation of the roller 87 therollers 99 and 91 will be caused to move therewith.

Secured to the vertical portion of the bracket 83 by means of the screws92 is an electric heater 94 having a pair of terminals 95 projectingfrom the bracket whereupon the rollers 87, 90 and 91 projecting from thebracket may be heated. The opposite stud shaft of the roller 87 isprovided with a pusher arm 96 so that upon rotation of the roller 87 inopposite directions the arm 96 will be caused to swing therewith, but itwill be noted from Figs. 10 and 11 of the drawings that the arm 96 ispositioned at an angle to the arm 60.

The tucker blade assembly comprises an upper section 97 and a lowersection 98 which are pivotally connected as at 99. The upper sectioncomprises a rectangular longitudinally extending bar 100 to the lowerface of which is connected a tucker blade 101 by means of set screwspositioned within the threaded openings 102. The outer face of this bar100 has a concave face 103 and connected to the opposite ends thereofare a pair of bars 104. Formed with the bars 104 are the verticallyextending bars 105 each having a bearing block 106 through which pins ofthe pivots 99 extend for pivotally connecting the same to the oppositeends of the lower section 98. The vertically extending bars 105 areconnected. by means of a pair of longitudinally extending rods 107 and108 and projecting from one of the bars 105 is a cam plate 109. Thelower section 98 comprises a singlebar having recesses 110 in theopposite ends thereof for receiving the bearing blocks 106. Ahorizontally extending slot 111 is formed within the lower member 97 forreceiving a lower tucker blade 112 which is retained therein by means ofset screws extending through the threaded recesses 113. The outer faceof the lower member 98 is provided with two concave faces which areseparated by the tucker blade 112.

Extending from one end of the lower member 98 is a threaded stud whichhas retained thereon by means of the lock nut 114 the lower slotted endof a bar 72 of the rocker arm 68. A similar stud 115 extends from theopposite end of the member 98 having connected thereto by means of thelock nut 116, the opposite link 72 of the rocker arm 68. A bearingextension 117 projects from this threaded stud 115 upon which revolvesthe cam arm 118. This cam arm 118 is retained upon the stud 115 by meansof a lock nut 119. An electric heater 120 is attached to the rear faceof the lower member 98 by means of the set screws 121 and is providedwith threaded studs 122 for providing an electrical connection to theheater 120 whereby the heat may be exchanged to the tucker blades 101and 112. The arm 118 is provided with a cam 123 adapted to press againstthe cam plate 109 so as at times to elevate the upper frame 97 of thetucker blade assembly in the manner as best shown in Fig. 19. The pusherarm 96 carried by the roller 87 of the rollerheater assembly is adaptedto contact with the cam arm 118 so that the latter may at times becaused to revolve about its supporting stud 117.

For normally retaining the swinging upper frame of the tucker bladeassembly upon the lower section 98 coil springs 124 are provided eachhaving one end con nected to the bar 107 and their opposite endsattached to the Section 98 by means of the set screws 125. As theconveyor causes the bags to pass through the tuckerheater station 8, theupper ends 126 of the bags will be positioned in the manner as bestshown in Fig. of the drawings, that is, between the roller-heaterassembly and the tucker blade assembly.

When the roller 64 travels within the two sections of the cam groove 67being concentric with the axis of the cam 66 the tucker-heater assemblywill be retained in the positions as illustrated in Figs. 17 and 19 ofthe drawings and when this roller 64 travels within the extensions 129and 130 of the cam groove 67 the tucker-heater assembly will be moved tothe positions as illustrated in Figs. 18 and 20 of the drawings.

Upon rotation of the cam shaft 47 the tucker cam 66 through itsconnection to the arm 63 will first cause the tucker-heater assembly tobe moved towards the rollerheater assembly, as is illustrated in Fig. 17of the drawings, and at the same time the cam 58 through its connectionto the rocker arm 54' will cause the lever 60 to be moved in thedirection of the arrow shown. The uppermost tucker blade 101 forces theupper end 126 of the bags towards the corrugated rollers 87 and and thelatter will draw the upper end of the bag therehetween to form the firsttuck 127 thereon and at the same time heat from the heaters 94 and willcause the wax upon the opposite folded faces of the bags to soften inorder that when again allowed to cool the wax will congeal therebysealing together the folds of the open end of the bags.

As the cam shaft 47 continues to rotate the roller 64 upon its travelthrough the cam groove extension 129 will cause the tucker-heaterassembly to be moved from the roller-heater assembly until it assumesthe position as illustrated in Fig. 18 of the drawings. At the same timethe cam 58 will cause the lever 68 to move in the direction of the arrowalso shown in Fig. 18 whereby the bags will be ejected from the rollers87 and 90 and allowed to drop by their own weight upon the table top 3.

Upon the continued rotation of the cam shaft 4'7 the tucker-heaterassembly will again be moved towards the roller-heater assembly until itassumes the position as illustrated in Fig. 19 of the drawings. At thesame time the lever 60 will continue to move in the direction of thearrow as also shown in Fig. 19 whereupon the pusher arm 96'will byengagement with the cam lever 118 cause the latter to swing upon itsbearing support 117. As the cam 123 rides upon the cam plate 109 theupper section 97 of the tucker-heater assembly will be caused to swingupon its pivoted connection 99 until it assumes the position as alsoshown in Fig. 19 whereat the upper tucker blade 101 is out of contactwith the roller-heater assembly. The lower tucker blade 112 thencontacts with the upper folded ends 127 of the bags forcing the samebetween the rollers 87 and 91 to form the second or double folds 128.The heat from the heater 94 and 120 will be transferred to the oppositefaces of all folds for softening the wax thereon.

As the roller 64 enters the cam groove extension 130 the tucker-heaterassembly will be moved to the position as illustrated in Fig. 20 of thedrawings or that after the double folds 128 have been completed and thewax on all faces of the folds softened due to the instantaneousapplication of heat thereto. At the same time the lever 60 will be moveduntil it travels from the position as shown in Fig. 19 until it assumesthe position as shown in Fig. 20 whereat the bags will be ejected fromthe rollers 87 and 91 and be permitted by their own weight to drop downupon the table top 3. The pusher arm 96 will also release the cam arm118 whereupon the upper section 97 of the tucker-heater assembly willreturn to its normal position upon the lower section 98 under theinfluence of the coil springs 124.

As the so heated and folded ends 128 of the bags are conveyed to thecooler-molding station 9 of the machine, they are retained between thestationary cooler 131 and the movable cooler 132 in the manner asillustrated in Fig. 21 of the drawings. Each of these coolers comprise arectangularly shaped and hollow body through which may circulate asuitable cooling fluid having connection therewith through the flexibletubing 133 and 134. The tubes 133 are connected to the nipples 135 ofthe movable cooler 132 whereas the tubes 134 are connected to thenipples 136 of the stationary cooler 131. These flexible tubes 133 and134 are connected to a main supply pipe 137 whereby the cooling agentmay be caused to circulate through the coolers at a predeterminedtemperature which will cause the wax upon the paper bags to quicklycongeal. The cooler 131 is supported upon the top angle irons by themain supporting frame by a pair of end brackets 138 which latter areattached to threaded studs formed With the opposite end of the cooler131 by means of the lock nuts 139. The movable cooler has a U-shapedbracket 140 extending over its opposite ends and along its outer face.The opposite ends of this bracket 140 are slotted so as to receive studbolts formed with the opposite end of the movable cooler 132. Thedepending links or plates 72 of the rocker arm which are connected tothe cooler cam 76 are also inserted over the threaded studs of thismovable cooler 132 and the bracket 140 together with the links 72 arelocked thereon by means of the nuts 141. The bracket 140 is alsoretained upon the movable cooler 132 by means of the lock nuts 142.

The outer face of the stationary cooler 131 is provided with a recess143 and the adjacent face of the movable cooler 132 is provided with astud 144 extending longitudinally throughout its entire length. As theupper folded ends 128 of the bags travel between the coolers and themovable cooler moved towards the stationary cooler, the folded ends ofthe bags Will be pressed within the recess 143 by means of a stud 144forming within the folded end of each bag a corrugation 147 whichextends longitudinally across the entire upper end of each bag therebymolding a larger surface of the bag at the same time causing the wax tocongeal about the folded sections of the bag as to effect a permanentseal.

At times it is desirable to punch a hole 148 within each bag whereby thelatter may be retained upon hooks of a display stand where the potatochips are offered for sale. In order to pierce this opening in each ofthe three bags positioned between the coolers, the movable cooler hasmounted therein three stationary female dies 149 whereas the cooler 131has corresponding male dies 150 slidably mounted therein in order thatwhen the coolers are forced towards one another the male dies 150 willpierce an opening 148 within each bag and as the coolers are separatedthe male dies 150 will be withdrawn thereby permitting the bags to dropby their own weight upon the table top 3. The outer ends of the dies15*!) are connected by a cross bar 151 and this cross bar 151 isnormally moved from the cooler 131 by means of the coil springs 152. Apair of ears 153 are formed with the cross bar 151 and pivotallyconnected to these cars is the link 80 of the pusher arm 79. Upon eachrevolution of the cam shaft 47, cam 82 will force the cross bar 151towards the cooler 132 as to cause the die members 150 to punch theopenings 148 within the bags, but as the roller 81 rides upon thereduced diameter of this cam 82 the coil springs 152 will withdraw thepunch members 150.

Mounted upon the machine frame is a junction box 154 having one conduit155 leading therefrom which is connected to the terminals 122 of thetucker-blade assembly so that its electrical heater 12f may be suppliedwith current. A conduit 156 extends from the heater 22 mounted upon thelower face of the table 3 and also is connected to the junction box 154.Another conduit 157 extends from the junction box 154 to the terminals95 of the heater within the roller-heater assembly. An-

other conduit 158 also extends from the toggle switch' 159 whichsupplies the flow of electrical energy to the motor 49.

From the foregoing, it will be readily understood that upon rotation ofthe cam shaft 47 a step by step motion will be transmitted to theconveyor belt 4 whereby one group of baskets 2 will be moved to thestation 8 whereupon the upper ends of the bags are forced between thecorrugated rollers so as to form two laps thereupon each having heatapplied to their opposite faces. This tucking or lapping operationshould take place in about two seconds of time in order that the intenseheat required to render the wax in a molten state is applied almostinstantly as if this heat is retained for a longer period of time, thefumes from the molten Wax has a tendency to enter the bags andcontaminate the foodstuffs therein. The movement of the bags from theheating and tucking station 8 to the cooling and molding station 9 takesabout one second and the cooling and molding operation upon the bagtakes place in about two seconds of time or a period of time equal tothat required for the heating and tucking operations. After the bagshave been so sealed the foodstuffs retained therein will keep fresh fora longer period of time as no moisture or moisture-vapor can penetratethe bag. The tucker blade 101 will apply heat to one face of the bag andthe rollers 87 and 96 will apply heat to the opposite faces thereof.This application of heat is effected almost instantaneously and the sofolded ends of the bags are promptly ejected from these heated elements.In the next second the tucker blade 112 applies heat to one face of thefolds of the bags and the rollers 87 and 91 apply heat to the oppositefaces thereof and then promptly ejected from the application of heat.Yet the wax remains in a molten state until the bags reach the station 9whereat the folded ends of the bags are not only molded, but the waxcaused to rapidly congeal under pressure to effect the permanent sealrequired. However, from such instant application of heat at hightemperature no fumes are given off as would have a chance of enteringthe bags. Groups of bags may now be in a progressive and continuousmanner heat sealed without the expensive application of adhesive orthick layers of wax about the open or filling ends of bags to be sealed.

I claim:

1. A tucker-heater assembly for closing and sealing the open ends of waxcoated paper bags comprising a supporting bracket, a pair of spacedbearing blocks connected to said bracket, an electric heater mountedupon said bracket, rotatable rollers journalled within said bearingblocks, a movable frame comprising a lower section and an upper sectionpivotally connected thereto, a tucker blade carried by each section ofsaid movable frame, an electric heater secured to said movable frame,means for moving said movable frame, and means for pivoting said uppersection upon rotation of said rollers in one direction as said frame ismoved towards said rollers, whereby said tucker blades will individuallyengage portions of the open ends of paper bags as fed thereto to conveythe same to said rollers.

2. A tucker-heater assembly for closing and sealing the open ends of waxcoated paper bags comprising a pair of spaced bearing blocks, anintermediate corrugated roller having its opposite ends journalledwithin said bearing blocks, a rocker arm connected to said roller torotate the latter in opposite directions, an upper and lower corrugatedroller journalled within said bearing blocks adapted to rotate with andin opposite directions to said intermediate roller, a movable holder, atucker blade carried by said holder, a second tucker blade, a memberpivotally connecting said second tucker blade to said holder, means formoving said holder whereby said tucker blades will be moved to and fromsaid rollers, a pusher arm connected to said intermediate roller forbeing pivoted thereby, a cam lever carried by said holder for contactingsaid pusher arm upon movement of said holder towards said rollersthereby pivoting said member.

3. A machine for closing and sealing the open ends of wax coated paperbags comprising a supporting frame, a drive shaft journalled upon saidframe, bearing blocks mounted upon said frame, an intermediate rollerjournalled within said bearing blocks, means for operatively connectingsaid drive shaft with said roller whereby the latter will be caused torotate in opposite directions, an

upper and lower roller journalled within said bearing blocks and adaptedto be connected with said intermediate roller as to be caused to rotatetherewith but in opposite directions thereto, a rocker arm operativelyconnected with said drive shaft whereby upon rotation there of a pivotalmovement will be transmitted to said rocker arm to and from saidrollers, tucker blades suspended from said rocker arm and extendingtowards said roller, one of said blades being pivotally connected tosaid rocker arm, means for pivoting said pivotal blade away from saidbags upon every second movement of said rocker arm towards said rollers,means for feeding the open ends of the bags between said rollers andtucker blades whereby upon each pivotal movement of said rocker arm saidtucker blades will alternate in delivering the open ends of the bagstowards and between a separate pair of said rollers for being foldedthereby, an electric heater mounted upon said frame for heating saidrollers and an electric heater connected to said rocker arm for heatingsaid tucker blades.

4. A machine for closing and sealing the open ends of wax coated paperbags comprising a supporting frame, a bracket mounted upon saidsupporting frame, bearing blocks secured to said bracket, superimposedcorrugated rollers journalled within said bearing blocks, means forcausing said rollers to alternately rotate in opposite directions, anarm pivotally supported upon said frame, a holder suspended from saidarm, means for transmitting motion to said arm for pivoting the same andmoving said holder to and from said rollers with said holder moving tosaid rollers each time said rollers rotate in an opposite direction, apair of superimposed tucker blades secured to said holder with one ofsaid blades being pivotally connected to said holder and extendingfurther from said holder than the other of said blades, means forfeeding the open ends of the bags between said rollers and said blades,means for pivoting said pivotally connected blade away from said rollersevery other time said holder moves to said rollers alternatelypresenting said blades to the open ends of said bags whereby said bagends are delivered between a separate pair of said rollers by one ofsaid blades each time said rollers rotate in an opposite direction andmeans for heating said rollers and tucker blades whereby the wax coatingupon the portion of the bags engaged thereby will be caused to soften.

References Cited in the file of this patent UNITED STATES PATENTS 64,197Clark Apr. 30, 1867 840,761 Forbis Jan. 8, 1907 1,993,442 Grevin Mar. 5,1935 2,015,093 Walker et al. Sept. 24, 1935 2,006,060 Schilder et al.June 25, 1935 2,114,624 Bergstein Apr. 19, 1938 2,146,831 Maxfield Feb.14, 1939 2,156,441 Watson et a1 May 2, 1939 2,200,971 Sonneborn et al.May 14, 1940 2,218,585 Merkle Oct. 22, 1940 2,253,036 Kimple et al. Aug.19, 1941 2,321,729 Beaseley June 15, 1943 2,641,882 Richard June 16,1953 FOREIGN PATENTS 439,657 Great Britain Dec. 11, 1935

